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@TildeGartenzaun @selzero
There is also Nerdcore Rap that kinda fits the description, but still pretty broad. Here is a song by Hieroglyphics that is RPG inspired and themed. Yeah, back from the late 90-ies!
A lot of independent/underground hip-hop artists reference pop culture including video games in their lyrics, the most recent example, AJ Suede: https://www.youtube.com/watch?v=UZD3ciOeNW0
There's a line about Abe's Odyssey. But I don't know of any artists being that narrowly themed, as to do this exclusively🤷